Geo - Node Actions CSS Cleanup Follow-up

What/Why

Follow up for @peterhegman notes here: !36867 (comment 380129940)
Blocked by gitlab-ui!1588 (merged)

Proposal

1. Wait for new class gl-sm-mx-0 and fix to class gl-sm-w-auto from above MR.
2. Update geo_node_actions.vue with the above classes
   2a. All buttons/button containers get the classes gl-w-full and gl-sm-w-auto
   2b. Replace class geo-node-actions with gl-mx-5 and gl-sm-mx-0
   
3. Delete current geo-node-actions classes in geo.scss